This Architectural Drawing is AutoCAD 2d drawing of Pier type 8 For canal type 800 in AutoCAD, Dwg files. Open piers can be classified into the following types: Cylindrical piers. Column bents. Trestle piers or Trestle bent. “Pier caps transfer the loads from the superstructure to the piers. They hold the bridge girders on bearing pads and disperse the loads from the bearings to the piers. Bridges with piers will all have pier caps to transfer the load from the superstructure. For more details and information download the drawing file.